package day0219;


import java.util.Scanner;

public class F5 {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        //new 文件名():  给引用类型变量赋值
        //1.用变量sc调用nextDouble()函数输入double数据，存入到score变量中。
        double score=sc.nextDouble();
        if(0<=score  &&  score<60){
            System.out.println("不及格");
        }else if(60<=score  &&  score<75){
            System.out.println("中等");
        }else if(75<=score  &&  score<85){
            System.out.println("良好");
        }else if(85<=score  &&  score<100){
            System.out.println("优秀");
        }else{
            System.out.println("成绩无效");
        }
    }
}









